Blind stitch machine



Nov. 10, 1953 A. GRECO 2,658,464

BLIND STITCH MACHINE Filed May 25, 1951 s Sheets-Sheet 1 To F007 OPE/PA r50 EDAL Smaentor X; E kittorneg Nov. 10, 1953 A. GRECO BLIND STITCH MACHINE 6 SheetsSheet 2 Filed May 23,

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A. GRECO BLIND STITCH MACHINE Filed May 25, 1951 6 Sheets-Sheet 4 Zmncntor W 6' Gttorneg Nov. 10, 1953 A. GRECO BLIND STITCH MACHINE 6 Sheets-Sheet 5 Filed May 23, 191

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BLIND STITCH MACHINE Filed May 25, 1951 3nventor Patented Nov. 10, 1953 UNITED STATES FTENT OFFICE 7 Claims.

This invention relates to sewing especially to sewing by machine and more particularly to blind-stitch sewing of two layers of material together at separated positions and blind-stitch sewing of buttons to material.

A principal object of this invention is to produce a sewing machine of such construction that material to be sewed together at separated positions will be positively and properly held firmly in one position while being sewed together and a button and material to which it is to be sewed will be held firmly, positively and properly while the button is being sewed to the material.

A further obj eot of this invention is to produce a machine of the type specified so constructed that the holding means for materials and buttons may be easily and quickly manipulatable to hold and also to release the materials and button.

A further object of the invention is to produce a machine of the type specified which will embody a tension mechanism for the thread used in sewing so constructed that a proper and efficient tension will be maintained for the type of sewing done.

Other objects and advantages will appear as the description of the particular physical embodiment selected to illustrate the invention progresses and the novel features will be particularly pointed out in the appended claims.

In describing the invention in detail and the particular physical embodiment selected to illustrate the invention, reference will be had to the accompanying drawings and the letters and ligures of reference thereon, in which:

Figure l is a top plan view of a machine em bodying my invention; Fig. 2 is a fragmentary end elevational view of the device as shown by Fig. 1 viewed in the direction of the arrow A; Fig. 3 is a fragmentary cross sectional view of the device, as shown by Fig. 2, on the plane in- I dicated by the line III-111 viewed in the direction of the arrows at the ends of the line; Fig. 4 is a fragmentary cross sectional View of the device as shown by Fig. 3 on the plane indicated by the line IV-IV viewed in the direction of the arrows at the ends of the line; Fig, 5 is a fragrnentary cross sectional view of the device as shown by Fig. i on the plane indicated by the line VV viewed in the direction of the arrows at the ends of the line; Fig. 6 is a fragmentary top plan view, with some parts broken away, illustrating the positioning of a material and a button to be sewed thereto: Fig. '7 is a view similar to Fig. 3 but illustrating the application of a tacking fitting; Fig. 8 is a fragmentary cross sectional view of the device as shown by Fig. '7 on the plane indicated by the line VIIIVIII viewed in the direction of the arrows at the ends of the line; Fig. 9 is a view similar to Fig. 6 but illustrating the arrangement of a tacking fitting; Fig. 10 is a perspective view of a tacking fitting of my invention; Fig. 11 is a perspective view of a wear plate of my invention; Fig. 12 is a plan view of a material and a label tacked thereto; Fig. 13 is a fragmentary view illustrating the position of thread, needle, and materials when tacking is performed; Fig. 14 is a View similar to Fig. 13 but illustrating the tacking of a label or the like to material; Fig. 15 is a fragmentary cross sectional view of the device as shown by Fig. 2 on the plane indicated by the line XVXV viewed in the direction of the arrows at the ends of the line; Figs. 16 to 21, inclusive, illustrate the operation of a machine of my invention in attaching a cloth shank button to material; Fig. 22 illustrates a fragment of material and a but ton attached thereto as the result of the operations illustrated by Figs. 16 to 21 inclusive; Fig. 23 illustrates the opposite side of material to which a button is attached; Fig. 24. illustrates a button receiver; Fig. 25 is a fragmentary plan view of the needle plate arranged to cooperate with a button having an eyelet shank; Fig. 26 is a fragmentary cross sectional view of the device as shown by Fig. 25 on the plane indicated by the line XXVIXXVI viewed in the direction of the arrows at the ends of the line illustrating the attaching of a button with an eyelet shank; Fig. 27 is a perspective view of a button with an eyelet shank suitable for attachment by my device; Fig. 28 is a perspective view of a button with a textile material shank suitable for attachment by my device.

For the purpose of illustration, the invention is shown in the accompanying drawings as embodied in a blind-stitch sewing machine of the general type illustrated in the United States patents to C. A. Dearborn, Nos. 679,553, 705,325, 705,326 and 814,025.

In general the machine comprises a main frame or longitudinal arm B, Fig. 1, which extends horizontally from substantially one end of the machine to the other. This arm B is supported at the right hand end, as viewed in Fig. 1, by a base frame C.

At the left of the arm B, as viewed in Fig. 1, a transverse arm D projects forwardly, at substantially a right angle to arm B, to about the position of the stitch forming mechanism, denoted generally by S.

The main drive shaft 5, is journalled in arm B. This drive shaft extends the length of B and protrudes at each end.

At the right hand end, as viewed in Fig. 1, the shaft is provided with a common and well known form of mechanism by which the shaft is driven a definite number of revolutions by a driven belt 2 on the pulley 3, and then the belt is automatically shifted to theloose pulley 4, so that, as. will hereinafter more fully appear, a definite:

number of stitches are formed by the stitch form ing mechanism and then the belt 2 is shifted to,

the loose pulley, the stitch forming mechanism stops and a manual operation is then necessary to start the stitch forming mechanism again. This mechanism and method of'operation are all well known and form no part of my invention.

The shaft l, at the left hand end thereoflas viewed in Fig. 1, has an eccentric attached thereto, best shown in Fig.4. This eccentric is-sur rounded by and reciprocates the eccentric -rod 6 which, at its upper end engages the arm of a crank l secured to the needle arm operating shaft.

The rotation of the shaft I, rotates thecam :5, thus reciprocating the eccentric rod 6, and so oscillates crank l and needle arm operating shaft 8.

At the forward end of shaft 8,'a needle operating arm 9 is secured to the shaft, as best :shown in Fig. '7. The needle operating arm secures .a curved needle ID, in any-suitable or appropriate manner as by a screw l.

Oscillation of shaft 8 causes needle .19 to .oscillate from left to right and vice versa, as viewedin Fig. 7, just skimming. the surface :of a transverse groove i2 .111 needleiplate I3, well shown in Figs. 5, 25. and 26.

Undue wear on needle plate I3 .is obviated by causing the needle to rub most strongly against hardened wear plate] 4", conveniently replaceable and held in place by any proper.orconvenient' means, as by screw screw-threaded into the needle plate 13, as .shown'inlFigs. 5, 11 and 25...

The needle platelB is secured to transverse arm D by forming arms 1.4, It and J6 .;thereon,.. arm [4 being well shown;in Fig. 4,.and arms [Sand 16 in -Figs..3;and 7. Anyproperorconvenient means may be used to secure the arms 14, I 5 and:

i6 to transverse arm D, I employ 'largehead screws l1, l3 and It.

The needle plate 13 is formed preferably of steel and is of a .sufiicient body tobe relatively very stiff and unyielding so that pressure'exerted.

thereagainst from below in; positioning material or a button thereagainst in the operation of the machine will not cause displacement or distortion thereof.

The needle plate -l.3, as .best showniin Fig. 5,'is. provided with an orifice 90. This'orifice allows a portion of material, positionedbelow the needle plate to somewhat protrude above the plate'into the path of the oscillating needle skimming: the surface of the groove -I2 so that the needle may pass into and then out of theematerial so protruding whereby, as will-hereinafter more fully appear, the thread, carriedbythe. needle, will follow a like pathas the needle.

In order to position material to be sewed and material to which a button is to be sewed, together with the button, in proper relation to the needle plate and needle, I have provided a sup-- porting means. This supporting means is particularly characterized by the fact that'it is strongly spring pressed upwardly, so that material supported thereby is pressed tightly against the under side of the needle plate, but is arranged to be manually depressable to afford. an opportunity to easily position the material or work after which the material or Work is then strongly pressed against the underside of the needle plate.

The immediate material, button or work support .is the fingerlll, wellshown inFig. 2. This finger is positioned, below .and centered :substantially on the intersection of a centre line of groove 12 .and a centre line of orifice 90 drawn substantially parallel to a long side of orifice 90.

Finger-.25) is carried by arm 2|, pivoted at 22 on the base C. On the under side of pivoted arm 2| is "a wear plate24 attached by any suitable or appropriate means tov the pivoted arm 2|, as by screw25. This wear plate 24 rests on roller 26, attached revolubly by screw 21 to one arm 28 to a two arm crank journalled on screw 29, screwthreaded into the base C'. Theother arm 30% of the crank extends upwardly and .is .secured to one. end of a spring 23. spring 23..is attachedtoa screw-threadedtlink 31 passing through a bore :in a projection 32 :of the base C. The outer end 33 of link 3| is screwthreaded. andis engaged by internally screwthreaded ethumb nut 34. It is evident that the stress exerted by spring 23 may bepincreased or diminished by turning'thumb nut 34 which bears against projection :32.

It is evident that the spring 23, operating on arm 30 causesthe crank to have a tendency, to rotate on 29 thus tending to move arm .28 and 25 upwardly :and so arm 2| andfingerZO, so that.

finger 2!) may be biassedtowardneedle plate l3 toany extent desired.

In order to limit the upward =movement of finger ,20-I provide a limiting stop therefor. From .one side of pivoted arm .2 l as best shown in Fig. 3, I drop a stop member 35 which isprovided with a stop shoulder 36, perhaps .best shown in Fig. 2. This stop shoulder lies in the path of a sector 31 pivoted at 38 on the base C. The sector also contactsadjustable rod 39 -so that the'upward tendency of stop. shoulder 36 against sector 31,- is resisted by sector 31 abutting rod 39. The

rod39 is .screw-threaded'into a projection 49 -.of

the base C andmay be adjusted longitudinally by turning thumb piece 41 and retained in adjusted' position by spring-pressed tooth 42 engagingserrations in theperiphery ofv thumb piece When, for the purpose of easily introducing work between the finger 20 and needle plate 13, it is desired to depress finger piece 25, then a downward .pull is given to rod 43, well shown in Figs. 2 and 3. This, of course, may be operated by .a .foot pedal, not shown.

Work material, as textile material or the like to be held up byfinger should also have a fur..- ther support .for thematerialnot directly con.- tacted. by 2.9, I provide such a support somewhat in the form. of a table 44, wel1. shown in Figs. 2 andB and in. plan inFig. 9. The table 44 is sup-.

ported and secured. inany proper orappropriate.

This swingingv threaded end of which is securing threaded nut 49, best shown in Fig. 3.

A spring attached at one end to. an eye 51 on 1 The other end of the bracket 45 and at the other end to needle plate it biases bracket t5 and so table M upwardly toward needle plate [3. However, a slight pressure downward on table 44 suffices to lower it so that material may be inserted easily between the top surface of the table and the under surface of the needle plate. Furthermore, a spring 52, best shown in Fig. 2, is attached at one end to an eye on the underside of bracket t5 and at the other end to pivoted arm 2|, and the relative stiifness of the springs to and 52 is so arranged that, 52 being the stiffer, when finger 2!] is depressed by manipulating manually operating rod :33, the table 44 is simultaneously depressed so that placing material between the top of the table and the under side of the needle plate is facilitated.

I have illustrated a well known form of loop thrower in connection with the mechanism as shown in the drawings. This loop thrower has arm 53, best shown in Fig. 5, provided with two thread engaging fingers 54 and 55, best shown in Fig. l, and thread groove 55 and thread shoulder 51. This loop thrower is adjustably attached, as by screw 55, to link 52. Link 58 is a continuation of link 59 with an interposed ball and socket supporting mechanism SI and 62. The socket portion 32 is in two parts, one part 63 being removable and screw held to permit clasping of ball iii. The socket portion is rotatably supported on M which is eccentrically positioned on 65 so that by rotating 6%) the loop throwing arm 53 may be raised or lowered to bring the fingers 5 and 55 closer to or farther away from the path of the needle it. The eccentric is secured in adjusted position by blind set screw 8%, best shown in Fig. 4;. The link 5i] extends to and is connected to a well known form of knuckle joint designated as a whole by K and best shown in Fig. 2. This joint K is attached to and operated by main shaft I. When operated the knuckle joint moves loop thrower arm 53 endwise and also causes the finger end to oscillate describing an arc of a circle just above the work piece.

The thread as used by the machine, see Fig. 2, comes from any suitable source and passes first through an orifice 61 in an adjustable up and down and in and out guide 68, held in adjusted position by screw 69. From guide 68, the thread passes between and beneath the center of a pair of spring-pressed friction discs ii! and H, well shown in Fig. 3. Then the thread passes through eye i2 attached to reciprocating rod E3. The thread then passes between and below the center of a pair of spring-pressed friction discs M and id, best shown in Fig. 3, thence to guide eye 16, guide eyes l? and i8 and to and through the eye of the needle ill just back of the point thereof.

During the operation of the machine no change takes place in guide 88, the pair of discs M and E5, or guides l8, T! or l8. However, shaft 8 has a cam '59 thereon, best shown in Fig. 15, this cam bears against rod Bil. Rod 80 bears against disc iii and when the high portion of cam 19 passes rod 8!] it forces rod as and disc is against the compression of 8! to slightly separate friction discs iii and ll to thereby remove the major holding power of these discs on thread 66. This action occurs while the needle I5 is advancing in the direction of the arrow 82, Fig. 15, until about the instant the point of the needle reaches just beyond the center of the orifice in the needle plate.

The rod '53 carrying eye 12 passes through and is guided by orificed stud 83, best shown in Fig.

5, supported by transverse arm D. The lower end of rod 13, as best shown in Fig. i, rests on arm as of a two arm crank, pivoted at and having the other arm 86 resting on an eccentric 81 secured on shaft l. The contact between arm 86 and eccentric is assured by spring 88 having one end attached to the transverse arm D and the other end attached to an extension 89 of the hub of arm 86.

As shaft I rotates and rotates eccentric 8? the rod 13 and so eye 12, is reciprocated up and down. The eye 13 is at about its maximum upper position when the needle It is at the extreme of its forward stroke. This motion of eye 72 tends to relieve tension thread 66 while the needle It is moving forward, but tends to hold more ternsion on the thread while the needle is returning.

The operation of my device in sewing a button to a material is well shown in Figs. 16 to 21 inclusive. For illustration I have selected a somewhat fiat form of button 9! having a cloth center 92 protruding from one side thereof.

The first step in attaching a button to textile material, by the practice of my invention, is to first depress the finger 28 by operating the rod 43 by a pedal or otherwise. This depresses finger 2i! and table 44 so that one may quite easily position a button St on finger 2!! and then, folding the material 93 to which the button is to be attached so that the fold line 955 may be positioned adjacent the cloth protuberance and both positioned to project somewhat within the orifice 99 of the needle plate l3 with the bulk of the material resting upon table it, the finger 28' is allowed to assume its biased position so that the button 91 and the material assume the position as shown in Fig. 16. With the work piece in the position as shown in Fig. 16, and the needle in with the thread 6% passing through the eye of the needle and a substantial length protruding, then the machine is started by shifting the belt, in the well-known manner from the loose pulley 4 to the pulley 3. The needle if! will. start forward and pass through a portion of the material 93 and through the protuberance 92 of the button 9| and will arrive at the position shown in Fig. 17. Meanwhile the loop thrower arm 53 moves forward into the position as shown in Fig. 1'? to enter the loop (-35 as the needle it starts back. The full forward motion of the loop thrower arm 53 is shown in 18. As the needle proceeds backwardly, the loop from the arm 53, in the well-known manner, moves into the position as shown in Fig. 19 and then rolls over to the position as shown in Fig. 29 so that the needle l0 advancing again can pass through the loop and proceed forward into the material 93 and the protuberance 92 on the button 9! while the loop former arm 53 moves backwardly as shown in Fig. 21, to again move forwardly rolling over to the position as shown in l? to protrude through the next loop as 95 formed by the advancing needle iii. These operations will be repeated a predetermined number of times and then, as hereinbefore stated, by well-known means, the main shaft I will cease rotating and the needle will cease oscillating. The thread is then properly cut and the whole operation is repeated after positioning another button and material as just hereinbefore described.

The material 93 and the button 9! when removed from in place as shown in 16, after the sewing has been completed will appear as shown in Fig. 22. When the material as is spread out flat removing the fold 9d and viewing the material from the side reverse from the button, the

appearance will be asshown: in Figa23,v that. is, all. stitches are shown indotted; lines toindicate that they do not appear upenthe ,face of the goods opposite to where the@button..-9I is attached.

Buttons used'for clothing are of various construction and variousforms. The button fll as shown in Fig. 16, is what might be calleds-a fiat form. Button 95, as shown in=Eig..28, is: of. a somewhat hemispherical form with a. protruding textile material 91. The button 98, as shown in Fig. 27, is of a somewhat hemispherical form but with a metal eye 99 for attachment-to material.

If a-machine of my inventionisto beused for attaching buttons such as 9S andfisl prefer toform. the finger 2!] with a; longitudinalgorifice I; therein, as shown inFig. 24,-anduse-an adapter. IOI provided witha tang, i jzfor positioningin the bore Ifill. Thisadapter. IIlI ispreferably formed with a concave upper'face I83 shaped to more nearly'perfectlycontact theoutside of a somewhat hemispherical button.

When sewing a button, such as 98, to material, I- prefer to modify the needle plate to" the form as indicated by IM with a raised somewhat domeshaped portion I I15 in-the center so that the eye 99 of a button 98 may project upwardly and fit into two notches I96 and It? as shown in 25. The dome-shaped portion I85 will have slots therethrough'as at, I-HS-and l Iii! to allow the passage of the needle- I D. This constructionwill allowthe needle II] to pass right through the eye 99 0f the button 98' after. passing. into the material 93.

The machine of my invention is 7 especially adapted for blind-stitch tackingvthat is, sewing materialtogether'at separated points. In order to do this more successfully, I- prefer to employ the tacking adapter designated: as a whole by F and illustrated in perspective-in Fig. 10 and shown inplace in Figs. 8, 9 and 13.

My tacking adapter Fcomprises alower portion I III- which extends upwardly within an upper portion I I2 andpasses through an orifice I I3- in the-top of I I2 and protrudes as a tacking ridge H4. The lower portion IIEI is provided with a finger operably threaded screw I I5 bywhich the device may beattached to the finger 20 of my depressible support.

When I desire to do tacking, I position the tacking adapter F on the finger 29 as shownin Fig. 8, and as illustrated in section in Fig. '7. I-place my adapter F on finger 2D in-position-so that when support 20 is'allowed to move-upwardlydue'to'its bias, the tacking ridge I I4 will protrude into the orifice 90 of theneedle plate I3 to the-desired extent. The adjustment 3! coacting with 39 controlling the bias, taking'care of the'amount' the said-taking ridge IM will protrude. The material to be tacked, as III; in Fig. 13, is interposed, when finger 2b is depressed, between the tacking ridge IE4 and the lower'surface of the needle plate I 3. When the material isso-placed it is held strongly in adjusted position" because, the upper portion H2 of adapter F pressesstrengly against the material at the two lips III and H8. This strong pressure is obtained by interposing springs H9 and I29 between-the lower and upper portions of adapter F.

The tacking is accomplished by starting the machine in the usual manner and allowing it to make. the predeterminednumber of stitches and then automatically stop, whereupon the. material to.be,tacke dis shiftedtoanew position and stitching. resumed.

.-I n-Fig.1l4 I have illustrated thetacking of. a minor-pieceof material. I2I to .a major piece of material, I22. The minor piece of material may be a; label to be attached. to .a garment and it is desired to blind tack stitch the corners of the label to the garment. .This could be doneby my machine by arranging the materialsas illustrated in-Fig. 14. The completed work is as illustrated inFig. 2. The stitches would shown on the label side of the garment, but would not shown on the oppositeside of the garment.

Although I have particularly described a preferred physicalembodiment of invention and modified. form thereof, nevertheless, I desire to haveit understood that the forms selected are merely illustrative, but .do, not exhaust the possible physical embodiments of the idea of means underlying my. invention.

.What I claim. as new and desire to secure by Letters Patent. is:

1. A sewing. machine of the blind-stitch type for formingand. applying stitchesto a stationary work piece includinga curved needle anda needle plate formedwith an orifice transverse thereto, including, in combination, asupport for. a work piece positioned beneath. the needle plate, .a.pivotedlever carrying the support whereby the support is reciprocable,,and spring means to bias the pivoted lever in a direction such that the support will be biased toward the needle plate, a pivoted two arm: crank, a spring, saidspring having one end attached to a rigid support and the other end attached to one arm of the crank, a revolvable disc mounted on the other arm of said crank, said disc bearing againstv said lever on the side remote fromthe needle plate whereby thesupport is biased toward the needle plate.

2. Asewing machine of the blind-stitch type for forming and'applying-stitches to a stationary work piece including acurved needle and a needle plateformed with an orifice transverse thereto, including, in combination, a support for a work piece positioned'beneath the needle plate, means supporting the support and adapted to allow the support to'reciprocate toward and away from the needle plate, said support provided at its end adjacent the needle support with a longitudinal orifice therein, a button adapter formed with a projection fitting the said-orifice and terminating at the outer end in a head formed with a depression adapted to correspond with and receive a specific button or the like.

3. A sewing machine of the blind-stitch type for. forming and applying stitches to a stationary work piece including; an arm, a curved needle and a needle plate carried by the arm and formed-with an orifice transverse to the needle, including, in combination, a workpiece receiving table, said table pivotallyrnounted. on the arm and in the same plane and adjacent to the needle plate whereby it may approach toward and recede from the level'of the lower face of the needle plate, spring means to. bias the table toward the needle plate, a support for a'work piece positioned beneath the needle plate, means supporting the support and adapted to allow the support to reciprocate toward and away from the needleplate.

4. A, sewing machine of the blind-stitch type for forming and applying stitches to a stationary work piece including a curved needle and a needle plate formed with. an orifice transverse thereto, including, in combination, a support for a work piecepositioned. beneath the needle plate, means supporting. the support and adapted to allowthe support to reciprocate toward and away from the needle plate, spring means to bias the support toward the needle plate, a manually operable means for drawing the support away from the needle plate and means for limiting the movement of the support toward the needle plate, the last mentioned means including an abutment on the support, a sector having one somewhat radial face positioned in the path of said abutment and the other somewhat radial face positioned to be contacted by an adjusting means, a pivot for said sector and a rod mounted on a rigid support to project into the path of said sector and limit its movement in one direction and manual means to adjust said rod longitudinally and means for retaining said rod in adjusted position.

5. A sewing machine of the blind-stitch type for forming and applying stitches to a stationary work piece including a curved needle and a needle plate formed with an orifice transverse thereto, including, in combination, a support for a work piece positioned beneath the needle plate, means supporting the support and adapted to allow the support to reciprocate toward and away from the needle plate, a tacking fitting for attachment to said support, said fitting including a portion attached but removably secured directly to said support, said portion formed with a tacking ridge adapted to be positioned in the orifice of said needle plate and to receive and support the material to be tacked just below the tacking position, said fitting including another portion reciprocable longitudinally relative to the first mentioned portion, the two portions slidable one on the other, headed bolts passing through each restraining too great separation thereof, a spring between the portions and around the bolts biasing the portions apart, a work piece receiving face adjacent and surrounding the tacking rib and slightly lower whereby the work piece may be wedged between the work receiving face and the under side of the needle plate with the tacking rib supporting the work piece at the position of a particular tack.

6. A sewing machine of the blind-stitch type for forming and applying stitches to a stationary work piece including a curved needle and a needle plate formed with an orifice transverse thereto, including, in combination, a support for a work piece positioned beneath the needle plate, means supporting the support and adapted to :allow the support to reciprocate toward and away from the needle plate, said needle plate formed with an upwardly projecting portion forming a depression in its under side adapted to receive and seat a button, said projecting portion formed with a transverse needle groove and on a line at a right angle to the needle groove with eyelet button shank receiving notches, one on each side of the needle groove whereby an eyelet shank button resting on the support is positioned to receive thread therethrough from the needle.

7. A sewing machine of the blind stitch type for forming and applying stitches to a work piece, including, in combination, a curved. needle and a needle plate formed with an orifice transverse thereto, a tacking fitting below the needle plate including two portions, one of said portions including a tacking ridge and the other of said portions including a work piece receiving face adjacent and surrounding the tacking ridge, said portions relatively reciprocable longitudinally, a spring resisting relative reciprocation of said portions, means for supporting and. reciprocating said fitting toward and away from said needle plate whereby a work piece may be wedged between the work piece receiving face and the needle plate with the tacking ridge supporting the work piece at the position of a particular tack in the surface of the needle plate.

ANTHONY GRECO.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 652,220 Phelps June 19, 1900 2,064,881 Bowman Dec. 22, 1936 2,113,107 Bowman Apr. 5, 1938 2,199,751 Mueller 1 May '7, 1940 2,416,941 Mueller Mar. 4, 1947 2,514,837 Buono July 11, 1950 

